1907 cover with London + NW Railway 4d Parcel Stamp KINGS LANGLEY + label

1907 an envelope addressed to London with m/s “Immediate Per L.N.W. Ry Co” bearing on front the 4d red on white “London and North Western Railway -Parcel Stamp” being cancelled by the station d/s of “Kings Langley 21 JUN 07” in purple ink and bearing on reverse the black on purple parcel label “L.& N.W. Ry – Paid Parcel from King’s Langley To Euston”. A rare and most attractive cover.